Search results
Hornblende is a complex inosilicate series of minerals. It is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark amphibole. Hornblende minerals are common in igneous and metamorphic rocks. The general formula is (Ca,Na) 2−3 (Mg,Fe,Al) 5 (Al,Si) 8 O 22 (OH,F) 2.
Hornblende is a rock-forming mineral that is an important constituent in acidic and intermediate igneous rocks such as granite, diorite, syenite, andesite, and rhyolite. It is also found in metamorphic rocks such as gneiss and schist. A few rocks consist almost entirely of hornblende.
Apr 23, 2023 · Chemical Properties. Hornblende Physical Properties. Ferro-hornblende Optical Properties. Magnesio-hornblende Optical Properties. Occurrence of Hornblende. It is a common component of many magmatic and metamorphic rocks such as granite, syenite, diorite, gabbro, basalt, andesite, gneiss and schist. It is the main mineral of amphibolites.
Hornblende. Baceno, Verbano-Cusio-Ossola Province, Piedmont, Italy. Hide all sections | Show all sections. About Hornblende Hide. Name: Named in 1789 by Abraham Gottlieb Werner from an old German term for dark minerals with no ore value and from "blende", meaning to deceive. A variety of Calcium Amphibole Subgroup.
General Formula: Ca2(Mg,Fe2+,Fe3+,Al)5(Si,Al)8O22(OH)2. Magnesio-hornblende: Ca2Mg3, (Al,Fe)Si7AlO22(OH)2. Ferro-hornblende: Ca2Fe2+4, (Al,Fe)Si7AlO22(OH)2. Composition. Complex basic silicate of sodium, calcium, magnesium, and aluminum. Some members have potassium, titanium, and fluoride. Variable Formula.
Hornblende, calcium-rich amphibole mineral that is monoclinic in crystal structure. Hornblende’s generalized chemical formula is (Ca,Na)2 (Mg,Fe,Al)5 (Al,Si)8O22 (OH)2. The four end-members and the cation content of their respective compositions are as follows: hornblende, Ca2 (Mg4Al) (Si7Al);
About Hornblende Hide. Hardness: 6. Specific Gravity: 3 - 3.4. Name: Named in 1789 by Abraham Gottlieb Werner from an old German term for dark minerals with no ore value and from "blende", meaning to deceive. Synonym of: Ferro-hornblende, Magnesio-hornblende.
